Assessing the Performance of Drought-Tolerant Rice Varieties under Varied Nitrogen Doses

Field experiments were carried out at ICAR- Indian Institute of Rice Research, Hyderabad during the dry season 2015/16 and 2016/17 to study influence nitrogen rates varieties on yield attributes, yield, use efficiency, economics puddled direct-sown rice Treatments comprised four nitrogen- control (no nitrogen), N100 (100 kg N ha-1), N120 (120 ha-1) N140 (140 as main plots drought-tolerant (V1-DRR Dhan 42; V2-DRR 44; V3-DRR 46 V4-IR 64). The experiment was laid in split-plot design with 16 treatment combinations each replicated thrice. results revealed that increasing application rate from N0 increased all varieties, but apparent differences between not observed. When compared DRR 42 or IR 64, 44 accumulated greater shoot biomass, tillers m-2, higher leaf area. significantly closely followed by than other reflecting a biomass production harvest index. Grain had positive quadratic relationship uptake grain (r2= 0.97 r2=0.94). total linear for (r2=0.98) observed (r2=0.93). 39.65% 41.5% 2016/17. Results show both produced soil straw exhibited NUE 64 (0, 100, 120 140 ha−1). Agronomic efficiency (ANUE) recovery (RE) can be called economising varieties. However, rates, applied declined. Also, found remunerative years recorded net returns Benefit:Cost ratio. recommended suitable variety Telangana zone, adapted drought-prone situations season.